Optical instrument.



C. B. BOYLE,-DEGD. E. J. a z. M. BOYLE, ADMINISTRATORS. OPTICAL INSTRUMENT. APPLICATION FILED MAY 3, 1907 93 1,673. Patgnted Au 17, 1909.

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UNITED- STATES PATENT oF IoE.

' ELVAJ. BOYLE AND'ZOLA M; BOYLE, NEW YORK, N. Y., ADMINISTRATORS OF CHARLES BARRY, BOYLE, DECEASED. i

OPTIQAL ms'rncmm'r.

I Specification 0! {letters Patent.

Patented. Aug. 17, 1909.

. Application filed May 3, 1907. Serial No. 371,740.

T 0 all whom 'it may concern:

- Be it known that-CHARLES BARRY BOYLE, now deceased, of whom the undersigned, EINA J. BOYLE and ZOLA M. BOYLE, who reside in the borough of Manhattan, city of New York state of New York, are the duly appointed administratrices, invented certain new and useful Improvements in Optical Instruments, of which the following is a specification.

The said improvements are hereinafter described and are illustrated in the accompanying drawings which form a part of this speci fication and in which Figure 1 is a horizontal section of the entire instrument. Fig. 2 is a vertical section of the reflector and prismatic glass on the line X-Y Fig. 1. Figs. 3 and 4 are respectively a front View and a profile section of the annular prismatic glass which may be employed in the manner hereinafter described.

R, is a paraboloid reflector. M, is its mouth.

F is the point of an electric carbon or other source of light located approximately at the focus of the said paraboloid reflector, the light from which, striking the walls-of said reflector at angles of radiation which are indicated by the dotted lines 1, 2, 3, and also by the solid lines G. H. is turned forward and passes through the mouth of the reflector in a direct beam.

C. C. is a double parabolic cone. so arranged concentrically within the large paraboloid reflector, R as to intercept all rays which would pass directly beyond the edges of the reflector. As stated this double parabolic cone C. C. is arranged within the reflector R and lies entirely between the source of light F and the mouth M of the reflector. That is to say, the rays between the lines G. H. describing an are smaller than the opening of the month of the reflector B would if not intercepted, pass beyond it as scattering light. Therefore the divergent rays between the lines G. H. are caught on the inner surface of the anterior section 7 of the double parabohc cone C, C.; thence they are deflected and passing through at the focus f. to the surface of the outer sec-- tion 8, of the double parabolic cone C. C.

' are sent forward in a direct beam indicated by the lines 4, 5,. (3. 'This double parabolic coneC. C.'takes the place of a concentrating lens.' The two parts or members are fitted back to back, the smalter ends being removed or cut away on lines correspomling with their respective foci. ,So formed. they are posed concentrically within the para boloid reflector R and at such a point 111 its optical axis as will place the flame ors'ource of light in perfect optical relation to the combined foci of the two reflectors C. C. i

The double parabolic cone G. C. is placed concentrically within the paraboloid reflector R and at the point and position where it intercepts all the rays of light between the lines G H, which rays would otherwise cscape as scattering light. The rays from the.

.The combination of. the paraboloid reflector with a source of light located approxi- 'mately at its focus and the two smaller cones vout through their respective foci and attached back to back and located entirely within. the reflector R and between the source of light and the mouth of the reflector, constitutes an arrangement available as a lamp for automobiles and other Vehicles or for lanterns. Y

P is a glass which is placed at the mouth of the reflector R and which is cut away between the points touched by the rays 4, 6. This glass consists of a succession of annular prisms as shown in Figs. 3 and 4.

N. Fig. 1, is a smaller curved reflector fastened to the back of the paraboloid reflector at L, L, the reflector R being cut away on the line L, L, to allow of the attachment of the smaller reflector N. The reflector N contains a cone C C whosesides are at a slightly divergent angle and whose action in gathering the radiant lightof its own reflector is exactly the same as described in the larger reflector R.

The lightfrom'the reflector N is caught upon the surface of a curved mirror m, whichis placed in a focus of its beam, and which is fastened to the reflector by a bar B and pivot b as shown. This light is flashed at will by the-turning of the mirror.

Fig. 2 is a vertical cross section'oflthe re.-

ings O, for-carbon points.

Figs. 3 and 4 are respectively a front view and profile section of the annular prismatic glass;-'- Fig. 4 showing four successive an; nular prisins' The circle S, is cut away as is alsotheangle A. The glas'shasnothing showingsef ion of glass cut away, and open-' whateverfiincommon with a semaphore, as U scribed, the combination of a parabollc rethe surface of a semaphore is curved, its steps are rectangular having none of the optical lines of a prism, and the li ht which passes through a semaphore remains white. This glass is distinctly a succession of-annul-ar prisms each constructed on the optical lines of a prism, and the light which passes through it is resolved into the seven colors-of the spectrum and the rainbow are.

Having thus described the invention, the iollowingls what isclaimed as new therem and what is desired to be secured by Letters 7 -'sc1'ibed, the combination of a reflector cut 1. The combination of a source of light, a paraboloid reflector, two smaller paraboloid reflectors which are cut away exactly at their foei and placed back, to back and which are located within the larger reflector and in such a-position as to intercept divergent rays and direct'them outwardly in parallel beams.

2. The combination of a source of light, a pa 'aboloid reflector, two smaller paraboloid reflectors which are cutaway exactly at their f foci'and placed back to back and which are glocated within the larger reflector. and in .1 such'a position as to intercept divergent rays and direct them outwardly inparallel beams, and means for resolving said light into the prismaticspectrum whereby a rainbow arc is produced. e

3.. In an instrument of the character described, the combination of aparabolic reflector cutaway at the back, a source of light located at the focus ofthe said reflector,

smaller reflector located at the ba'ekof the mam reflector, a mirror located in a focus of the beaniof said smaller reflector, and means at the;mouth of thelarger reflector for resolving" the light into the prismatic spectrum whereby a rainbow are 1s produced.

4. In an instrument of the character deand means located'at the mouth of the larger reflector for resolving the light into the PIIS- matic spectrum whereby a rainbow are 18 produced.

5. In-an instrument of the cha 'acter deaway at the back, a source of light located at the focus of the reflector to the rear of the back opening, a cone located in the reflector between its mouth, or; larger opening, and -the source of ,light, for receiving and focusing on a mirror all light which would otherwise diverge through the mouth of the reflector, with. said mirror located within the focusof the beam of the said reflector ,and exterior to'its month or larger openin This specification 'si ned and witnessed this: 10th day of April, D., 1907.

' ELVA J. BOYLE, ZOLA M. BOYLE, A(.lministmtors of Charles Barry Boyle, (leceasetl. Signed in the presence of- H1 RBER'1 KN IG1 rr, M. Dons! l uni an.

focus of the beam of said smaller reflector 

